File doxygen-dot-one-thread.patch of Package doxygen

From: Michel Normand <normand@linux.vnet.ibm.com>
Subject: doxygen ppc64le ignore DOT NUM THREADS to 0
Date: Wed, 07 Oct 2015 14:11:22 +0200

doxygen ppc64le ignore DOT NUM THREADS to 0 as a bypass to boo#921577

===================================================================
--- doxygen-1.8.12/src/dot.cpp  2016-05-10 21:51:52.000000000 +0200
+++ doxygen-1.8.12_new/src/dot.cpp      2016-09-06 19:42:27.244474872 +0200
@@ -1192,9 +1192,12 @@
   m_queue = new DotRunnerQueue;
   int i;
   int numThreads = QMIN(32,Config_getInt(DOT_NUM_THREADS));
+  if (numThreads==0) {
+    numThreads = 1;
+    msg("use single threaded despite DOT_NUM_THREADS=0 (bypass boo#921577)\n");
+  }
   if (numThreads!=1)
   {
-    if (numThreads==0) numThreads = QMAX(2,QThread::idealThreadCount()+1);
     for (i=0;i<numThreads;i++)
     {
       DotWorkerThread *thread = new DotWorkerThread(m_queue);
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